<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model="msg">
        <h1 v-once>{{msg}}</h1>
        <h1>{{msg}}</h1>
    </div>
</body>
<script src="./vue.min.js"></script>
<script>
    const vm = new Vue({
        el:"#app",
        data:{
            msg:"干的漂亮"
        }
    })
</script>
</html>